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Where does Oxford comma come from?

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The Oxford comma takes its name from its use as house style at the Oxford University Press (OUP) in Oxford, England since 1978. Harvard University Press also insists on the comma in its materials, so the punctuation is sometimes known as the Harvard comma stateside.

The point of the comma is to reduce ambiguity in a series, the absence of which can lead to some amusing situations (e.g., Top stories: World leaders at Mandela tribute, Obama-Castro handshake and same-sex marriage date set …). Enough said.

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Technically, the Oxford comma is optional in English. The Chicago Manual of Style and, of course, the Oxford Style Manual, require the Oxford comma in lists of three or more things. Others, like the Associated Press Stylebook and The New York Times, nix it because they see it as extraneous. Yet others, like The Guardian Style Guide, recommend the Oxford comma only when it clears up a potential confusion. Some non-English-language writing conventions also get rid of the Oxford comma, like French.

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Who uses Oxford comma?

Whether or not to use the Oxford comma is the subject of heated debate—at least among us style and grammar nerds. Rockers Vampire Weekend flashed their prep-school cred in their 2008 song, “Oxford Comma.” In it, they ask “Who gives a fuck about an Oxford comma?” The answer, apparently, is just about everyone.

While it might be optional, not using the Oxford comma has sometimes had serious consequences. Because an Oxford comma was lacking from a Maine law, a dairy lost a case and had to pay out a $5 million settlement to its employees. The judge David J. Barron noted, “For want of a comma, we have this case.”